Complete the frustrated roommate's text message by choosing the correct articles.

"Could you please put ___ milk back in ___ fridge when you're done? It's turning into cheese on the counter!"

The correct answer is the / the.

We use "the" when the speaker and listener both know exactly which items are being talked about. In a shared apartment, there is usually a specific carton of milk they share and a specific fridge in their kitchen. Using "a" would imply any random milk or any random fridge!